devi cercare manualmente e cancellare dal tuo pc
C:\Programmi\QUAD Utilities\QUAD Registry Cleaner\QUAD Scheduler.exe
da hijackthis elimini
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O4 - HKLM\..\Run: [CTFMON] C:\WINDOWS\system32\wscript.exe /E:vbs C:\WINDOWS\system32\winjpg.jpg
O4 - HKLM\..\Run: [regdiit] C:\WINDOWS\system32\win.exe
O4 - HKCU\..\Run: [QUAD Windows service] C:\Programmi\QUAD Utilities\QUAD Registry Cleaner\QUAD Registry Cleaner.exe -h
O4 - HKCU\..\Run: [QUAD Scheduler] C:\Programmi\QUAD Utilities\QUAD Registry Cleaner\QUAD Scheduler.exe
TOGLI AVG come antivirus e installa nod32 in versione trial lo aggiorni e gli fai fare una bella scansione completa